Hello @Ganesh Thorave , Thank you for reaching out.
If understand it correctly you have a FortiGate firewall and Jump Server (VM) deployed in a Vnet and you are unable to ping the jump server from your FortiGate CLI. Typically in such scenarios the issue is due to a NSG blocking ICMP traffic you can follow steps mentioned below to troubleshoot this issue. To validate this point you can also perform a TCP ping and see if it is blocked.
- Can you validate if a NSG at VM's NIC/Subnet level is not blocking any ICMP traffic? if it helps you can check out connection troubleshoot in Azure Network Watcher to help pin-point the issue to any specific NSG rule.
- You can also check whether your VM's OS firewall is not blocking ICMP traffic. For Windows OS you can run
New-NetFirewallRule –DisplayName "Allow ICMPv4-In" –Protocol ICMPv4
command to enable ICMP traffic. - If possible, you can also perform a packet capture to help pin-point this issue.
Hope this helps! Please let me know if the issue still persists. Thank you!